Lime water turns milky up on passing CO2 gas

Chemistry

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Lime water (calcium hydroxide solution) turns milky when carbon dioxide gas is passed through it because the carbon dioxide reacts with the calcium hydroxide to form insoluble calcium carbonate, which appears as a white precipitate.

The chemical reaction is:
\ceCa(OH)2(aq)+CO2(g)−>CaCO3(s)+H2O(l)\ce{Ca(OH)2(aq) + CO2(g) -> CaCO3(s) + H2O(l)}

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